Quoted from jsa:I've looked pretty hard for them. So far I'm not seeing anything published. I get the concept of wanting to sell/control replacements, though I feel it may be to prohibit "after-market" alternatives or additions.
Their communication protocol is mostly known now, someone could reasonably sit down at this point and make an after market node board of their own design.
I don't know if there is any payoff to that though.